data-reverse.md

Data Reverse ^{6 Kyu}

^{LINK TO THE KATA - ARRAYS FUNDAMENTALS}

Description

A stream of data is received and needs to be reversed.

Each segment is 8 bits long, meaning the order of these segments needs to be reversed, for example:

11111111  00000000  00001111  10101010
 (byte1)   (byte2)   (byte3)   (byte4)

should become:

10101010  00001111  00000000  11111111
 (byte4)   (byte3)   (byte2)   (byte1)

The total number of bits will always be a multiple of 8.

The data is given in an array as such:

[1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,0,1,0,1,0,1,0]

Solution

const dataReverse = data => {
  if (data.length === 0) return []

  return data
    .join('')
    .match(/\d{8}/g)
    .reverse()
    .join('')
    .split('')
    .map(character => Number(character))
}